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Climatic influence on demographic parameters of a tropical seabird varies with age and sex

AuthorsOro, Daniel ; Torres, Roxana ; Rodríguez, Cristina; Drummond, Hugh
KeywordsBlue-footed Booby
Capture–recapture modeling
Life-history traits
Population dynamic
Sula nebouxii
Issue DateApr-2010
PublisherEcological Society of America
CitationEcology - Ecological Society of America 91 (4) :1205–1214 (2010)
AbstractIn marine ecosystems climatic fluctuation and other physical variables greatly influence population dynamics, but differential effects of physical variables on the demographic parameters of the two sexes and different age classes are largely unexplored. We analyzed the effects of climate on the survival and recruitment of both sexes and several age classes of a long-lived tropical seabird, the Blue-footed Booby (Sula nebouxii), using long-term observations on marked individuals. Results demonstrated a complex interaction between yearly fluctuations in climate (both local and global indexes, during both winter and breeding season) and the sex and age of individuals. Youngest birds' survival and recruitment were commonly affected by local climate, whereas oldest birds' parameters tended to be constant and less influenced by environmental variables. These results confirm the theoretical prediction that sex- and age-related variation in life-history demographic traits is greater under poor environmental conditions, and they highlight the importance of including variability in fitness components in demographic and evolutionary models. Males and females showed similar variation in survival but different recruitment patterns, in relation to both age and the spatial scale of climatic influence (local or global). Results indicate different life-history tactics for each sex and different ages, with birds likely trying to maximize their fitness by responding to the environmental contingencies of each year.
Description10 páginas, 4 figuras, 5 tablas.
Publisher version (URL)http://dx.doi.org/10.1890/09-0939.1
Appears in Collections:(IMEDEA) Artículos
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